Molding pieces, molding piece removably engaging devices, kits and systems, and methods

A molding piece, comprising:

• a molding piece structure;
• and
• at least a first magnetic element,
• wherein:
• the first magnetic element is in contact with the molding piece structure,
• the molding piece structure has a first end and a second end,
• the molding piece structure has a molding piece structure imaginary axis that extends through the first end of the molding piece structure and the second end of the molding piece structure,
• cross-sections of the molding piece structure along imaginary planes perpendicular to the molding piece structure imaginary axis are substantially the same size and shape, and
• cross-sections of the first magnetic element along said imaginary planes are substantially the same size and shape.

A molding piece, comprising:

• a molding piece structure;
• and
• at least a first magnetic element,
• wherein:
• the molding piece structure has a first end and a second end,
• the molding piece structure has a molding piece structure imaginary axis that extends through the first end of the molding piece structure and the second end of the molding piece structure,
• cross-sections of the molding piece structure along imaginary planes perpendicular to the molding piece structure imaginary axis are substantially the same size and shape,
• the molding piece structure further comprises at least a first a protruding rib, and
• the first magnetic element is on a surface of the molding piece structure.

A molding piece removably engaging device, comprising:

• a removably engaging device structure;
• and
• a first element,
• wherein:
• the first element is in contact with the removably engaging device structure,
• the first element has a first element imaginary axis, and
• the first element comprises at least one of a magnetic element and a magnet-adhering element.

A molding piece removably engaging device, comprising:

• a removably engaging device structure;
• and
• at least first and second elements,
• wherein:
• the first element is in contact with the removably engaging device structure,
• the second element is in contact with the removably engaging device structure, and
• each of the first element and the second element comprises at least one of a magnetic element and a magnet-adhering element.

A molding piece removably engaging device, comprising:

• a removably engaging device structure;
• and
• a first element,
• wherein:
• the first element comprises at least one of a magnetic element and a magnet-adhering element,
• the first element is in contact with the removably engaging device structure,
• the removably engaging device structure comprises at least a first rib,
• the first rib has a first rib imaginary axis,
• the first element has a first element imaginary axis,
• the first rib imaginary axis is substantially parallel to the first element imaginary axis.

A molding piece removably engaging device, comprising:

• a removably engaging device structure;
• and
• a first element,
• wherein:
• the first element comprises at least one of a magnetic element and a magnet-adhering element,
• the first element is in contact with the removably engaging device structure,
• the first element has a first element imaginary axis,
• the removably engaging device comprises at least a first groove,
• the first groove has a first groove imaginary axis,
• the first groove imaginary axis is substantially parallel to the first element imaginary axis, and
• the first element is spaced from the first groove.