generally spherical shape to the toy construction 110 the magnetic light assembly 112 includes a substantially cylindrical outer surface 127 and the cavity 121 includes a substantially cylindrical inner surface 131 the two cylindrical surfaces 127 131 are dimensioned so as to produce a friction fit between the magnetic light assembly 112 and the receptacle 113 upon insertion of the former into the latter when the downward facing surface 128 of the magnetic light assembly 112 is brought into contact with the bottom surface 123 of the cavity 121 the magnetic light assembly 112 will tend to remain lodged in the receptacle 113 unless and or until it is intentionally dislodged therefrom in operation the magnetic light assembly 112 illuminates the spherical toy construction 110 from within producing intriguing visual effects the nickel coating 117 has a silvery reflective appearance that also enhances the attractiveness of the spherical toy construction 110 and increases the potential interest of the user the access hole 125 enables the user to dislodge the magnetic light assembly 112 from the cavity 121 for any purpose for example the user can change the batteries 136 switch to another magnetic light assembly 112 having leds 134 with different colors and or a different pattern of illumination and.