What's even more interesting is that C++ and Objective-C started around the same time, and while one is known about widely, the other is still used heavily in the macOS and iOS ecosystems today. Indeed, the creator of Java acknowledged that Objective-C inspired the Java runtime, in particular its late-binding and message sending capabilities, which is what Java has used to this day to allow applications to still run unchanged, even after all these years.
A shame that the price of Java was the death of Strongtalk then, really.