frame member 11 this is also shown in detail in fig2 and 4 the innerfitment between the projections and the indentations on the various frame members is shown in detail in fig4 there it will be seen that the projection 63 on the frame member 11 fits within the undercut 77 in the frame member 12 whereas the projection 48 on the frame member 12 fits within the undercut 76 on the frame member 14 if desired additional latching can be effected between frame members 14 and 12 such as by the projections 81 84 disposed in the frame members 14 and the undercut members 85 87 on the frame member 12 this is best seen in conjunction with fig2 and 6 in the description herein it should be understood that similar components of the described modular blocks are designated by the same number except followed with different letters the versatility and modularity of the modular block is exemplified with respect to fig5 and 6 there it will be seen that several of the frame members such as 12 12a and 12b have been interconnected so as to afford placement of several panel members such as 16 17 56 and 57 in between to result in a modular unit generally 70 this versatility to sandwich fit a multiplicity of panels is afforded by the frame member 12 which is specifically fig3 and its interconnection with similar frame members 12a and b as shown in fig6 it is seen that frame member 12 not only can receive the frame member 14 on one side but also can interconnect with a similar frame such as shown as 12a at the opposite side by interfitment of the.