The phrase "wonderful invention" refers to something that is very clever, creative, and useful. It describes an object or idea that is impressive and brings joy or makes life easier or better in some way. Full definition
Along with nearly monthly updates on improvements to the pencil, such wonderful inventions as the combination pen - stapler were promoted with all the gusto the magazine reserves for a new smartphone launch today. (canadianbusiness.com)
It's like I forgot how wonderful an invention Pinterest was and suddenly I was hooked all over again. (rejoiceinthejourney.com)
What he has done is responded to the variety of light in the subject with the most wonderful invention of different pencil marks so that within the whole drawing each place gives off its own precise illumination. (painters-table.com)